Add an About menu entry and dialog based on Gtk.AboutDialog

src/main.py

@@ -65,6 +65,10 @@ class Application(Gtk.Application):
         menu_button.set_menu_model(menu)
 
         # Create actions for the app menu items.
+        about_action = Gio.SimpleAction.new('about', None)
+        about_action.connect('activate', self.on_about)
+        self.add_action(about_action)
+
         new_game_action = Gio.SimpleAction.new('new_game', None)
         new_game_action.connect('activate', self.on_new_game)
         self.add_action(new_game_action)
@@ -83,7 +87,8 @@ class Application(Gtk.Application):
         try:
             self.keyfile = GLib.KeyFile()
             self.keyfile.load_from_file(self.keyfile_path,
-                                        GLib.KeyFileFlags(3))
+                                        GLib.KeyFileFlags.KEEP_COMMENTS |
+                                        GLib.KeyFileFlags.KEEP_TRANSLATIONS)
             self.lowest_turns = self.keyfile.get_integer(
                 'general', 'lowest-turns'
             )
@@ -100,6 +105,21 @@ class Application(Gtk.Application):
     def do_activate(self):
         self.window.present()
 
+    def on_about(self, action, parameter):
+        dialog = Gtk.AboutDialog(
+            authors=['David Boddie'],
+            license_type=Gtk.License.GPL_3_0,
+            logo_icon_name='treasure',
+            transient_for=self.window,
+            modal=True
+        )
+
+        def close_dialog(dialog, response):
+            dialog.close()
+
+        dialog.connect('response', close_dialog)
+        dialog.run()
+
     def on_quit(self, action, parameter):
         self.quit()
 

src/ui/menus.ui

@@ -2,6 +2,10 @@
 <interface>
   <menu id="menu">
     <section>
+      <item>
+        <attribute name="action">app.about</attribute>
+        <attribute name="label" translatable="yes">_About</attribute>
+    </item>
       <item>
         <attribute name="action">app.new_game</attribute>
         <attribute name="label" translatable="yes">New Game</attribute>